max
54 lines
2.2 KiB
C#
54 lines
2.2 KiB
C#
using MoonTools.ECS;
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using Nerfed.Runtime.Scene.Streaming;
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using System;
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namespace Nerfed.Runtime.Resources;
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/// <summary>
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/// A typical rendering preparation system that natively resolves and requests
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/// asynchronous background loading for its own required assets, removing the
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/// need for a monolithic generic AssetStreaming manager.
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/// </summary>
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public class SampleRenderSystem : MoonTools.ECS.System
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{
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private readonly Filter _meshVisualsFilter;
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public SampleRenderSystem(World world) : base(world) {
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_meshVisualsFilter = FilterBuilder
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.Include<SampleMeshVisualComponent>()
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// Always ignore chunk entities technically "unloading" from RAM
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.Exclude<ChunkUnloadPendingTag>()
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.Build();
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}
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public override void Update(TimeSpan delta) {
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foreach(Entity entity in _meshVisualsFilter.Entities) {
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SampleMeshVisualComponent visualComp = Get<SampleMeshVisualComponent>(entity);
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// 1. Resolve State
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ResourceState vertState = ResourceManager.GetState(visualComp.VertexShader.AssetId);
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ResourceState fragState = ResourceManager.GetState(visualComp.FragmentShader.AssetId);
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// 2. Asynchronously request assets if they don't exist in memory yet
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if(vertState == ResourceState.Unloaded) {
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ResourceManager.Retain<Shader>(visualComp.VertexShader.AssetId, "Unknown/Path");
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}
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if(fragState == ResourceState.Unloaded) {
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ResourceManager.Retain<Shader>(visualComp.FragmentShader.AssetId, "Unknown/Path");
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}
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// 3. Prevent rendering logic unless ALL strictly required assets are fully mapped
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bool isReadyToDraw = vertState == ResourceState.Loaded && fragState == ResourceState.Loaded;
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if(isReadyToDraw) {
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// At this exact point, you can safely assume:
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// 1) The background loading threads are 100% finished processing these shaders.
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// 2) The GraphicsDevice can safely extract the native handle.
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// e.g. GraphicsDevice.BindShader(visualComp.VertexShader.AssetId);
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// e.g. GraphicsDevice.DrawPolygons(...);
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}
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}
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}
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}
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